Should I go 35F or 35M?

You've already got a few answers, with a lot of info. So I'll try not to cover what has been covered. I was a 35M for about 10 years (now retired). During that 10 years, I spent about 5 in a 35F job, because they were short Foxes. There are always exceptions, based in the individual, the unit, and the missing, but GENERALLY speaking 35Ms will get out and about more than 35Fs. However, 35Ms for the most part only exist in MI units, whereas 35Fs exist in pretty much all units in the Army. (35Ms are often attached out to combat arms units for certain missions or even full deployments, which enables them to get out and about, but they are assigned to MI units.). 35Ms generally are 65/35 brains/brawn ratio - gotta be smart, able to think on your feet, able to see the big picture, and able to see where the wholes in the big picture are so you can go fill them. Also have to be able to keep up with the combat arms folks if you do get to go out on patrol. 35Fs are more like 80/20 or 85/15 brains/brawn - gotta be able to not only see the big picture and identify the holes, but also figure out what PROBABLY goes in the holes, as well as how to conclusively fill the gaps beyond conjecture. Also need to maintain basic Soldier fitness. 35M is more social and psychological, 35F is more cerebral.
Of course, you could sign up for 35 M and end up doing the 35F job anyway, like I did - or sign up for 35F and be doing HUMINT analysis (which is technically a 35M job, even though neither the Foxes or the Mike's usually want to admit it).
I hope that helps compare and contrast the two a little bit better for you, so you can make a (little bit more) informed decision.

*Standard caveats apply - this is only my opinion, not valid in all states, certain restrictions apply, past performance is no guarantee of future growth, void where prohibited, if you experience any of these side effects consult your doctor, etc.

First off, kudos to you for deciding to serve your country. Now I see that you have gotten bombarded with several answers more so, it seems answers that focus more on changing your mind due to personal experience. That is fine, however, to address your question it is all a matter of who you are as a person. While all of the intelligence disciplines are important and some do carry a heavy weight towards the future there will always be humans around to talk with and gain information from. In order to make that choice I would advise that you take some serious time to weigh and consider your own personality. First, how do you feel about interacting with new people. If you have trouble making friends or talking with strangers then 35M could be a bad choice. Although, I have met a few introverted 35M's they are the exception, not the rule. Second, the 35M field attracts those with dominant personalities, if you struggle in dealing with those kinds of individuals then 35M might not be a great fit. Third, 35M is a field that requires a lot of emotional stability, if you struggle controlling your own emotions when people push your buttons then you might struggle with the school which will challenge your ability to keep your wits about you while maintaining focus on the task at hand. While this list could go on about the negatives and personality quirks that help with career fit, think about it this way, could you do the job your recruiter is doing and perform well?

While much of what I have covered is negative in nature from what you are saying about your skill set points to 35F, that is not a bad skill set to have in the 35M field. It is a blessing especially if your mind works quickly in analyzing facts and data. That will help leaps and bounds in the planning and preparation that goes hand in hand with the job. Additionally the skill set taught in that course is foundationally exceptional for many civilian jobs which can be easily translated into career opportunities if you decide to stay reserves and look for a steady job. However, if you think you might transition to active duty then advancement might be a challenge, when I left the service active duty was crowded and promotions were slower moving.

I hope this helps to answer your question to a reasonable degree. Good luck with making your prospective career choice.

So you are deciding between either being an analyst (35F) or a collector (35M). Depending how that fits with your personality, skill-set, and how you see yourself contributing to the intelligence community. HUMINTers do a lot of engagements and interacting, as it’s in the name human intelligence. 35F is a lot of the behind the scenes, IE: pattern analysis, reporting writing, slide building, working with maps,

I’ll put it this way: 35M’s typically have better opportunities to go to schools, albeit this will be limited for you as a reservist. 35M’s right now go to DLI after AIT, so you’ll be fluent in a language. Very useful and valuable. Also, you might be able to go to SOC, DSDC, etc. Schools for 35F are very limited.